ERA5 almanac comparison — 8 years of real data
Nashville vs Portland: weather in June
Essentially a tie in June: Nashville is 30% clear historically, Portland is 27% clear (8-year ERA5 average) — within the noise. Avg high 86°F vs 73°F. Pick based on flight time or price, not weather — the weather won't decide this one for you.
What you are reading: 8-year historical averages, not a forecast.
Either destination can still surprise you this specific June. For this
week’s actual forecast, each destination links to its live page below.
Nashville
TN
- Clear days, June
- 30%
- Sample size
- n=240 days
- Avg high
- 86°F
- Early June (1st–15th)
- 34%
- Late June (16th–end)
- 26%
- Rain frequency
- 49% of days
Portland
ME
- Clear days, June
- 27%
- Sample size
- n=240 days
- Avg high
- 73°F
- Early June (1st–15th)
- 21%
- Late June (16th–end)
- 33%
Compare Nashville vs Portland in another month
All percentages are historical averages from the ERA5 reanalysis via Open-Meteo, 8 full years (2018–2025). “Clear” means avg high ≥ 72 °F, precipitation < 1 mm, and a non-precipitation weather code. This is history, not a forecast. The live 7-day outlook for any destination is on its own page and may differ from the long-run average. Data from Open-Meteo.